Ocado said it faced "a reduction in sales growth" after a fire that started Tuesday damaged the facility in Andover, southern England, affecting about one-tenth of its warehousing operations.
Chief Fire officer Neil Odbin from Hampshire Fire and Rescue has already revealed that the fire has spread into a second building on the site and efforts to extinguish the blaze are hampered due to the internals and dangers within the multi-million-pound warehouse.
But now, the whole of Walworth Business Park has been evacuated, according to reports.
The fire broke out in the early hours of Tuesday morning as more than 200 firefighters struggled to keep it under control.
Some homes 1.6km away from the site were due to be evacuated depending to the wind direction, Hampshire Fire and Rescue Service said.More news: Five teens, aged 12 to 16, charged with killing musician
The spokesperson continued: "The removal of these materials is now complete and the evacuation area has been removed, with local residents and workers now able to access the affected area as normal".
The online grocery giant said: "We apologise to all those affected by this incident and are very thankful to the people of Andover for their understanding and support during this hard period".
"As previously announced, there has been substantial damage to the Andover building and its contents".
Four firefighters were treated for minor smoke inhalation, but no Ocado staff were injured.
"120+ firefighters are risking their lives tackling the blaze".More news: Prosecutor Manafort meeting with Russian at heart of probe
Part of the roof collapsed. "Thank you. Stay safe".
Ocado added it was working to minimise disruption for customers by increasing capacity at its three other major United Kingdom facilities in Hatfield, north of London, Erith, near the capital and Dordon in central England.
The online grocer's share price fell 14 per cent in just two days as it warned the blaze would hit full-year sales. The company said it has comprehensive insurance for the property, stock and equipment, as well as for business-interruption losses.
More than 30,000 orders - 10% of Ocado's capacity - are processed by robots at the Andover warehouse each week, but Ocado has not yet given any detail about what the impact will be to customers.More news: Prince Philip Surrenders Driver's License 3 Weeks After Car Crash